Half to johx richie



(No Model.) G- AMPBELL.

LAWN MOWER.

Patented Apr. 13, 1886.

Jim enter.

Wibzesses.

ta. a M r N. PETERS. PhqwL-mn n hu. Washinglun. 0.0.

UNTTED STATES PATENT Orrrcn.

GEORGE CAMPBELL, OF TORONTO, ONTARIO, CANADA, ASSIGNOR OF ONE- HALF TO JOHN RICHIE, JR, OF SAME PLACE.

LAWN-MOWER.

SPECIFICATION forming part of Letters Patent No. 339,616, dated AprillS, 1886.

Application filed March 95,1884. Serial No. 125,509.

5 of Ontario, Canada, have invented a new and useful Improvement in Lawn-Mowers, of which the following is a specification.

My invention relates to certain improve ments in mowing-machines for lawns or pleasure-grounds; and it consists in the novel construction and combination of parts hereinafter described and claimed, and illustrated in the accompanying drawings, in which- Figure l is a plan of my machine. Fig. 2 is D a section on the line 31, certain parts being broken away. Fig. 3 is a plan of the lever mechanism controlling the knives. Fig. 4. is a sectional elevation of the same. Figs. 5 and 6 are details of separate 3' oints of the said. levers.

A is the frame of the machine, of the shape shown, having extending arms B, to which the upper knife,0,is attached. The frameAh-as a slot,a,whiehscrves asa bearing for the axles of the driviugwvheels. These axles extend. no farther through the slot than is sufficient to secure them by means of the jam-nuts b and c. The driving-wheels have inside gearing-teeth, E, which mesh with the tooth-wheel l (Shown in dotted .lines in both figures.) This wheel 'F is journaled on a shaft, G, borne in solid bearings in the frame A, on which is alsojournaled the tooth-wheel H, which meshes with the pinion I, which is journalcd on the crank-shaft J, which has solid bearings in the frame A. In the center of this shaft is the crank K, carrying the driving or connecting rod L, which terminates in the knucklejoint M, which connccts to the jointed levers before mentioned. The top knife, 0, which may also be considered as a knife-guard, is rigidly secured to the frame A, which it also helps to brace. Beneath it are two other knives of precisely the same construction. Onthe top knife, 0, is the center pin, N, of this combination of levers firm- 1y riveted. On this pin is pivoted a two-arm ed lever, 0, extending each side of the pivot. One end of this lever is jointed to thelever P, which is pivoted on a pin, Q, securely riveted to the lower knife. The other end of lever O is jointed to the lever B, pivoted to the pin S, which is riveted. to the center knife. For the (No model.) Pnienh-d in Canada July 7, 1884, No. 19,694.

working of this pin a slot is cut in the upper knife, as, for the working of the'pin Q, slots are cut in the two upper knives. SlotsT are also out in the whole of the knives through which bolts pass. This arrangement secures the parallel motion of all the knives. It will be seen that the joint at U carries the end M of the connecting-rod, which actuates these levers. half'revolution straightens the togglelevers and causes the knives to give two cuts, the top knife being stationary, the middle knife moving to the right makingone cut, and the lower one to theleft making asecond. Another halfrevolution causes the knives to reverse their movementsniaking two outs, thus making four cuts to one revolution of the crank. The knife teeth have square edges, instead of the usual beveled ones,and, being pressed together by the bolts t 25, passing through the slots T T, the constant friction sharpens theback teeth at the same ratio as the front ones wear and become dull, and when thought necessary the bolts t i. can be removed. The lower knives may be turned round, and with them the said conditions of sharpening, the dull edges being at the back and the others at the front ready for work.

V are dividers.

W' is a guard extending the whole length (and, preferably, consists of a curved or round ed metal plate secured to said lower knife by bolts or other suitable means) of the lower knife, to protect it from entering the ground if the handle be lifted too high. This guard reciprocatcs with the lower knife in its movement.

lfit be desired, in case of obstructiomto drive the machine by other means than the wheels D for a short time, this object may be obtained by the wheels D being thrown out of gear. By loosening the jam-nuts b and moving said wheels back they are released from meshing with the tooth-wheels F. The next step is to throw the bevel-wheel'X into gear with the wheel Y. This wheel Y is keyed on the shaft Z, which passes through the frame A, and is riveted to the universal joint 6. By adj nsting the setscrew f in the collar 9 the shaft Z is pushed down, and the wheelSr meshes with the wheel X. On the universal joint 0 isasquare socket holding loosely, and with room in it to hen the crank K is set in motion,its

travel to and fro, the end of the crank-handle h, which is set in bearings 1', extending upward from the wood handlej, so that when the wood handlej is elevated or depressed the push of 5 the crank-handle h on the universal joint 6 and shaft Z is not affected thereby. The crankhandle h, being turned by hand, thus actuates the wheel H, and consequently the crank K, and puts the knives in motion.

k is a follower adjustable by means of a setscrew, in the usual manner.

l is a metal hood extending the whole length of the knives and secured or hinged to the top -knife. Its object is to prevent the grass or 1 dbris from interfering with the j ointed levers. m is a shield of thin metal kept in position by being bolted to the frame A at n, and serves to protect the driving-wheel gear from injury by stones or other obstructions. It is shown broken away in the drawings,in order to show the interior gear ofthe driving-wheel.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a mowing-machine, the combination, with the upper knife rigidly secured to the frame of the machine,and provided with back and front V-shaped teeth with square edges, of the two lower knives provided with similar back and front teeth moving in opposite directions and each connected with the operatinglever by bolts working in slots in the knives, substantially as described.

2. In a mowing-machine, the combination, with the three knives constructed as shown, of a lever pivoted at its center to the fixed knife and secured to the connecting-rod of the machine at one end, and short levers connecting at one end to the arms of the pivoted lever, and at their other ends connected to the center and lower knives, respectively, substantially as described.

3. In a mowing-machine, the combination, with the knives constructed as shown, of the guard W, consisting of a curved or rounded plate extending the entire length of the lower knife and secured to and reciprocating there with, substantially as and for the purpose described.

4. In a mowing-machine, the combination of the crank K, connecting-rod L,toggle levers O P R, and the knives connecting with said toggle-levers, "substantially as described.

'5. The combination, with the knives, of the toggle-levers O, P, and R, and pins S N Q, the center pin, N, being riveted to the top knife, the pin S to thesecond knife, aslot being made in the top knife for its passageand the pin Q, riveted to the bottom knife,with similar slots in the top and middle knives, as and for the purpose specified.

G. CAMPBELL.

Witnesses:

W. TEAWIKER, GEORGE EAST. 

